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Rheological Characterization of Phenol-Formaldehyde (Resole) Resin

机译:苯酚-甲醛(甲阶)树脂的流变特性

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Resoles are usually made from a mixture of phenol and a molar excess of formaldehydeunder basic conditions. Condensation of phenol and formaldehyde in basic medium is carriedout in a series of experiments in order to serve as models in a study aimed at establishing itsstructure rheological characterization when dissolved in acetone. ChemCAD simulationsoftware is adapted in this study in order to design a simulation to the real factory product. Thissoftware simulation is used for the first time in such study. The operation conditions employedin the real production site is tested on this model in order to check its applicability. Thesimulation showed good behavior when the modified manufacturing procedure is applied. Eightsamples of Resole dissolved in acetone are used in this study. Their structure rheologicalcharacterization is carried out by plotting flow curves of different concentration and molecularmass. An important figure in this rheological study namely; the mass of network strand (Me) isobtained. When plotted against concentration (C) i.e. Log Me vs. Log C aslope gave rise to thescaling exponent X, which is a measure of the penetration hindrance. A scaling exponent of0.23 is obtained in this study which is below the value expected for a network with freepenetration. Therefore, partial penetration is expected.
机译:甲阶酚醛树脂通常由苯酚和摩尔过量的甲醛的混合物制成 在基本条件下。进行基本介质中苯酚和甲醛的缩合 进行一系列实验,以便在旨在建立其模型的研究中充当模型 溶于丙酮时的结构流变性。 ChemCAD模拟 在本研究中对软件进行了修改,以便针对实际的工厂产品设计仿真。这 该研究中首次使用软件仿真。使用的操作条件 为了检查其适用性,在实际生产现场中对该模型进行了测试。这 当应用修改的制造程序时,模拟显示出良好的行为。八 这项研究使用了溶解在丙酮中的甲阶酚醛树脂样品。它们的结构流变学 通过绘制不同浓度和分子的流动曲线进行表征 大量的。该流变学研究中的一个重要人物是:网络链的质量(Me)为 获得。当针对浓度(C)作图时,即Log Me与Log C的斜率引起了 比例指数X,它是渗透障碍的量度。标度指数为 在这项研究中获得0.23,低于使用免费网络的预期值 渗透。因此,期望部分渗透。

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